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From: "fchelnokov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/113522] New: std::swap cannot be called with explicit
 template argument std::array<int,3>
Date: Sat, 20 Jan 2024 09:22:53 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 13.2.1
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: fchelnokov at gmail dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113522

            Bug ID: 113522
           Summary: std::swap cannot be called with explicit template
                    argument std::array<int,3>
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fchelnokov at gmail dot com
  Target Milestone: ---

This program

#include <array>
#include <utility>

int main() {
    std::array<int,3> a, b;
    std::swap< std::array<int,3> >( a, b );=20
}

is accepted by MSVC and Clang with libc++, but GCC with libstdc++ complains:

error: no matching function for call to 'swap<std::array<int, 3>
>(std::array<int, 3>&, std::array<int, 3>&)'

Online demo: https://godbolt.org/z/8xnd5PsfE

Related discussion: https://stackoverflow.com/q/77844837/7325599=